WD hitch forces are not involved directly in TT sway dynamics because they are vertical forces. However, changes in TV axle loads can have a significant effect on TV/TT sway dynamics primarily due to changes in steering response. The vertical load on the tires determines how much horizontal force the tires can generate.
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We can conclude that the WD hitch can be "indirectly" involved in TT sway dynamics, since the WD hitch is responsible for changes in TV axle loads.
